Teresa is the soul of the sword. It is said that she always smiles when she kills demons, so she is called "smiling Teresa". He saved young Krea many times. Although he didn't like Claire's following at first, he gradually opened his heart to Claire. I want to leave Claire in the human village and let her grow up happily. Later, because the thieves killed the village and wanted to take Claire away, the angry Teresa killed all the thieves, thus committing the organization's iron law "Don't kill". When it is cleared, it cuts the companion and leaves the tissue.
Then the organization sent soldiers from 02 to 05 to crusade. Despite this, Teresa did not release the demon power when she besieged herself from the 2 nd to the 5 th, and easily defeated four people and left. However, Priscilla, who had just been promoted to No.2, was spared because he could not bear it for a moment. Priscilla had a strong sense of mission to the organization and lacked practical experience. He liberated a large number of evil forces in pain and anger and pursued them vigorously.
Because of her youthful impulse, Priscilla did not listen to dissuasion and released more than 70% of the demon power, while Teresa also released the demon power that only changed the color of her eyes (10%) and completely suppressed it, defeating Priscilla who released more than 70% of the demon power again. At this time, Priscilla, who was bent on defeating Teresa, was confused and unable to change back to human form because she released too much demon power, and begged Teresa for help with her last reason. Teresa decided to behead her in order to prevent her from becoming an awakened one. Priscilla's mental confusion made Teresa soft-hearted. Just as Teresa hesitated, Priscilla woke up and attacked Teresa when she wasn't looking. Unfortunately, Teresa was beheaded by Priscilla, ending her legendary life.
Claire volunteered to put Teresa's flesh and blood into her body and joined the organization to become a big sword, with the purpose of killing Priscilla for Teresa. Claire became the only member who volunteered to join the organization.